Changes in myometrial expression of progesterone receptor membrane components 1 and 2 are associated with human parturition at term
Ray Wang A , Penelope M. Sheehan A B C and Shaun P. Brennecke A
+ Author Affiliations
- Author Affiliations
A Pregnancy Research Centre, Royal Women’s Hospital, 20 Flemington Road, Parkville, Vic. 3052, Australia.
B University of Melbourne Department of Obstetrics and Gynaecology, Royal Women’s Hospital, 20 Flemington Road, Parkville, Vic. 3052, Australia.
C Corresponding author. Email: penny.sheehan@thewomens.org.au
Reproduction, Fertility and Development 28(5) 618-627 https://doi.org/10.1071/RD13430
Submitted: 17 December 2013 Accepted: 29 August 2014 Published: 30 September 2014
Abstract
While the exact mechanism of human parturition remains unknown, functional progesterone withdrawal is believed to play a key regulatory role. Progesterone receptor membrane components 1 and 2 (PGRMC1, PGRMC2) are putative progesterone receptors and the aim of this project was to investigate their expression in human myometrium. Human term myometrium was obtained from the lower uterine segment incision in women undergoing elective (not-in-labour, NIL; n = 11) and emergency Caesarean sections (in-labour, IL; n = 10), following written consent. PGRMC1 and 2 expression was quantified using real-time reverse transcription polymerase chain reaction and western blot. Subcellular localisation was performed by immunohistochemistry and immunofluorescence. There was a significant decrease in PGRMC1 mRNA (P = 0.0317) and protein expression (P = 0.0151) in IL myometrium, compared with NIL myometrium. PGRMC2 mRNA expression (P = 0.0151) was also decreased in IL myometrium, compared with NIL myometrium. Immunostaining studies confirmed the presence of PGRMC1 and 2 in smooth-muscle cells. Expression was perinuclear in NIL myometrium and more generalised and cytoplasmic in IL myometrium. The decrease in PGRMC1 expression and the translocation away from a perinuclear location for both PGRMC1 and 2 could contribute to a functional progesterone withdrawal that may ultimately initiate parturition.
Additional keywords: myometrium, PGRMC-1, PGRMC-2.
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